$EWBC
EAST WEST BANCORP INC Stock $ewbc

$ewbc Overview Financials Valuation SEC Filings Company Website

2021 Q4 Form 10-Q Financial Statement

#000106915721000081 Filed on November 08, 2021

Income Statement

Concept	2021 Q4	2021 Q3	2020 Q3
Revenue		$415.3M	$365.7M
YoY Change		13.56%	-23.31%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$40.40M	$46.00M	$27.20M
YoY Change	69.75%	69.12%	-12.54%
% of Gross Profit
Operating Expenses
YoY Change
Operating Profit
YoY Change
Interest Expense		$19.60M	$41.60M
YoY Change		-52.88%	-61.16%
% of Operating Profit
Other Income/Expense, Net
YoY Change
Pretax Income	$277.1M	$273.4M	$196.1M
YoY Change	29.85%	39.46%	-4.99%
Income Tax	$59.30M	$47.98M	$36.52M
% Of Pretax Income	21.4%	17.55%	18.63%
Net Earnings	$217.8M	$225.4M	$159.5M
YoY Change	32.72%	41.31%	-6.93%
Net Earnings / Revenue		54.28%	43.62%
Basic Earnings Per Share		$1.59	$1.13
Diluted Earnings Per Share	$1.519M	$1.57	$1.12
COMMON SHARES
Basic Shares Outstanding	141.9M shares	141.9M shares	141.5M shares
Diluted Shares Outstanding		143.1M shares	142.0M shares

Balance Sheet

Concept	2021 Q4	2021 Q3	2020 Q3
SHORT-TERM ASSETS
Cash & Short-Term Investments
YoY Change
Cash & Equivalents	$3.913B	$4.853B	$4.507B
Short-Term Investments
Other Short-Term Assets
YoY Change
Inventory
Prepaid Expenses
Receivables
Other Receivables
Total Short-Term Assets
YoY Change
LONG-TERM ASSETS
Property, Plant & Equipment	$97.30M	$96.96M	$107.5M
YoY Change	-5.76%	-9.81%	-11.05%
Goodwill	$465.7M	$465.7M	$465.7M
YoY Change	0.0%	0.0%	0.0%
Intangibles
YoY Change
Long-Term Investments	$290.0M	$297.0M	$193.0M
YoY Change	35.51%	53.89%	1.58%
Other Assets
YoY Change
Total Long-Term Assets
YoY Change
TOTAL ASSETS
Total Short-Term Assets
Total Long-Term Assets
Total Assets	$60.87B	$60.96B	$50.37B
YoY Change	16.71%	21.02%	16.4%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable
YoY Change
Accrued Expenses	$982.0M	$1.212B	$921.0M
YoY Change	9.11%	31.6%	93.49%
Deferred Revenue
YoY Change
Short-Term Debt	$300.0M	$300.0M	$408.0M
YoY Change	-6.54%	-26.47%	755.54%
Long-Term Debt Due
YoY Change
Total Short-Term Liabilities	$982.0M	$1.212B	$921.0M
YoY Change	9.11%	31.6%	93.49%
LONG-TERM LIABILITIES
Long-Term Debt	$152.0M	$152.0M	$1.579B
YoY Change	0.0%	-90.37%	938.82%
Other Long-Term Liabilities
YoY Change
Total Long-Term Liabilities	$152.0M	$152.0M	$1.579B
YoY Change	0.0%	-90.37%	283.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$982.0M	$1.212B	$921.0M
Total Long-Term Liabilities	$152.0M	$152.0M	$1.579B
Total Liabilities	$55.03B	$55.27B	$45.25B
YoY Change	17.37%	22.15%	17.85%
SHAREHOLDERS EQUITY
Retained Earnings	$4.684B	$4.513B	$3.876B
YoY Change	17.08%	16.45%	9.3%
Common Stock	$168.0K	$168.0K	$167.0K
YoY Change	0.6%	0.6%	0.6%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$649.8M	$649.6M	$633.5M
YoY Change	2.48%	2.54%	32.13%
Treasury Stock Shares	25.88M shares	25.88M shares	25.66M shares
Shareholders Equity	$5.837B	$5.690B	$5.126B
YoY Change
Total Liabilities & Shareholders Equity	$60.87B	$60.96B	$50.37B
YoY Change	16.71%	21.02%	16.4%

Cashflow Statement

Concept	2021 Q4	2021 Q3	2020 Q3
OPERATING ACTIVITIES
Net Income	$217.8M	$225.4M	$159.5M
YoY Change	32.72%	41.31%	-6.93%
Depreciation, Depletion And Amortization	$40.40M	$46.00M	$27.20M
YoY Change	69.75%	69.12%	-12.54%
Cash From Operating Activities	$422.6M	$342.0M	$161.2M
YoY Change	62.23%	112.16%	62.83%
INVESTING ACTIVITIES
Capital Expenditures	-$6.000M
YoY Change	122.22%
Acquisitions
YoY Change
Other Investing Activities	-$1.293B	-$2.216B	-$989.7M
YoY Change	-44.98%	123.86%	14.07%
Cash From Investing Activities	-$1.299B	-$2.216B	-$989.7M
YoY Change	-44.79%	123.86%	13.55%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-68.40M	730.6M	794.9M
YoY Change	-104.31%	-8.09%	287.19%
NET CHANGE
Cash From Operating Activities	422.6M	342.0M	161.2M
Cash From Investing Activities	-1.299B	-2.216B	-989.7M
Cash From Financing Activities	-68.40M	730.6M	794.9M
Net Change In Cash	-945.1M	-1.143B	-33.60M
YoY Change	86.63%	3301.49%	-94.08%
FREE CASH FLOW
Cash From Operating Activities	$422.6M	$342.0M	$161.2M
Capital Expenditures	-$6.000M
Free Cash Flow	$428.6M
YoY Change	62.84%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
	dei	Entity Central Index Key EntityCentralIndexKey	0001069157
	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2021
	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	Q3
	dei	Amendment Flag AmendmentFlag	false
CY2019	us-gaap	Accounting Standards Update Extensible List AccountingStandardsUpdateExtensibleList	http://fasb.org/us-gaap/2021-01-31#AccountingStandardsUpdate201613Member
	dei	Document Type DocumentType	10-Q
	dei	Document Quarterly Report DocumentQuarterlyReport	true
	dei	Document Period End Date DocumentPeriodEndDate	2021-09-30
	dei	Document Transition Report DocumentTransitionReport	false
	dei	Entity File Number EntityFileNumber	000-24939
	dei	Entity Registrant Name EntityRegistrantName	EAST WEST BANCORP, INC.
	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	95-4703316
	dei	Entity Address Address Line1 EntityAddressAddressLine1	135 North Los Robles Ave.
	dei	Entity Address Address Line2 EntityAddressAddressLine2	7th Floor
	dei	Entity Address City Or Town EntityAddressCityOrTown	Pasadena
	dei	Entity Address State Or Province EntityAddressStateOrProvince	CA
	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	91101
	dei	City Area Code CityAreaCode	626
	dei	Local Phone Number LocalPhoneNumber	768-6000
	dei	Security12b Title Security12bTitle	Common Stock, par value $0.001 per share
	dei	Trading Symbol TradingSymbol	EWBC
	dei	Security Exchange Name SecurityExchangeName	NASDAQ
	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
	dei	Entity Small Business EntitySmallBusiness	false
	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
	dei	Entity Shell Company EntityShellCompany	false
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	ewbc	Lendingfees Lendingfees	56965000	USD
	ewbc	Lendingfees Lendingfees	56455000	USD
CY2021Q3	ewbc	Depositaccountfees Depositaccountfees	18508000	USD
CY2020Q3	ewbc	Depositaccountfees Depositaccountfees	12573000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	20981000	USD
	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	18718000	USD
CY2021Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	13101000	USD
CY2020Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	4553000	USD
	ewbc	Depositaccountfees Depositaccountfees	51233000	USD
	ewbc	Depositaccountfees Depositaccountfees	33892000	USD
CY2021Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	7156000	USD
CY2020Q3	ewbc	Interestratecontractsandotherderivativeincome Interestratecontractsandotherderivativeincome	5538000	USD
CY2020Q3	ewbc	Foreignexchangeincome Foreignexchangeincome	3310000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	35634000	USD
	ewbc	Foreignexchangeincome Foreignexchangeincome	15691000	USD
CY2021Q3	ewbc	Wealthmanagementfees Wealthmanagementfees	5598000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	20460000	USD
	ewbc	Wealthmanagementfees Wealthmanagementfees	12997000	USD
CY2021Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3329000	USD
CY2020Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	361000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6601000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1443000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	354000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	698000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	1178000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11867000	USD
CY2021Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	5349000	USD
CY2020Q3	us-gaap	Noninterest Income Other NoninterestIncomeOther	5239000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	13870000	USD
	us-gaap	Noninterest Income Other NoninterestIncomeOther	6652000	USD
CY2021Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	2198000	USD
CY2020Q3	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	3495000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	7484000	USD
	us-gaap	Noninterest Income Other Operating Income NoninterestIncomeOtherOperatingIncome	8000000	USD
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	73109000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	54503000	USD
	us-gaap	Noninterest Income NoninterestIncome	214406000	USD
	us-gaap	Noninterest Income NoninterestIncome	165715000	USD
CY2021Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	105751000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	99756000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	318985000	USD
	us-gaap	Labor And Related Expense LaborAndRelatedExpense	298671000	USD
CY2021Q3	us-gaap	Occupancy Net OccupancyNet	15851000	USD
CY2020Q3	us-gaap	Occupancy Net OccupancyNet	16648000	USD
	us-gaap	Occupancy Net OccupancyNet	47150000	USD
	us-gaap	Occupancy Net OccupancyNet	49941000	USD
CY2021Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4641000	USD
CY2020Q3	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	4006000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	12791000	USD
	us-gaap	Federal Deposit Insurance Corporation Premium Expense FederalDepositInsuranceCorporationPremiumExpense	11133000	USD
CY2021Q3	ewbc	Deposit Account Expense DepositAccountExpense	4136000	USD
CY2020Q3	ewbc	Deposit Account Expense DepositAccountExpense	3113000	USD
	ewbc	Deposit Account Expense DepositAccountExpense	11845000	USD
	ewbc	Deposit Account Expense DepositAccountExpense	10029000	USD
CY2021Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3575000	USD
CY2020Q3	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	3590000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	12088000	USD
	us-gaap	Information Technology And Data Processing InformationTechnologyAndDataProcessing	11896000	USD
CY2021Q3	ewbc	Computer Software Expense ComputerSoftwareExpense	8426000	USD
CY2020Q3	ewbc	Computer Software Expense ComputerSoftwareExpense	8539000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	23106000	USD
	ewbc	Computer Software Expense ComputerSoftwareExpense	22006000	USD
CY2021Q3	us-gaap	Professional Fees ProfessionalFees	1635000	USD
CY2020Q3	us-gaap	Professional Fees ProfessionalFees	1224000	USD
	us-gaap	Professional Fees ProfessionalFees	4978000	USD
	us-gaap	Professional Fees ProfessionalFees	3854000	USD
CY2021Q3	us-gaap	Legal Fees LegalFees	2363000	USD
CY2020Q3	us-gaap	Legal Fees LegalFees	1366000	USD
	us-gaap	Legal Fees LegalFees	5840000	USD
	us-gaap	Legal Fees LegalFees	6093000	USD
CY2021Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	20998000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	58544000	USD
	us-gaap	Other Noninterest Expense OtherNoninterestExpense	57489000	USD
CY2021Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	38008000	USD
CY2020Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	17209000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	90657000	USD
CY2020Q3	us-gaap	Other Noninterest Expense OtherNoninterestExpense	17122000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	57819000	USD
CY2021Q3	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
CY2020Q3	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	0	USD
	ewbc	Securities Sold Under Agreements To Repurchase Charges Related To Extinguishment SecuritiesSoldUnderAgreementsToRepurchaseChargesRelatedToExtinguishment	8740000	USD
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	205384000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	172573000	USD
	us-gaap	Noninterest Expense NoninterestExpense	585984000	USD
	us-gaap	Noninterest Expense NoninterestExpense	537671000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	273431000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196060000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	779296000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	472343000	USD
CY2021Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	47982000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	36523000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	124111000	USD
	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	68630000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	225449000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
	us-gaap	Net Income Loss NetIncomeLoss	655185000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.62
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.57
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.82
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141880000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141799000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143143000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142043000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143051000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143082000	shares
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	225449000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
	us-gaap	Net Income Loss NetIncomeLoss	655185000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-41178000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	4634000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	-101577000	USD
	us-gaap	Other Comprehensive Income Availableforsale Securities Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeAvailableforsaleSecuritiesAdjustmentNetOfTaxPortionAttributableToParent	49903000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	51000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	87000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	551000	USD
	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss After Reclassification And Tax Parent OtherComprehensiveIncomeLossCashFlowHedgeGainLossAfterReclassificationAndTaxParent	-1246000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-1752000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	5459000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-867000	USD
	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	3065000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-42879000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-101893000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	USD
CY2021Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	182570000	USD
CY2020Q3	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	169717000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	553292000	USD
	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	455435000	USD
CY2020Q2	us-gaap	Stockholders Equity StockholdersEquity	4987243000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
CY2020Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	8648000	USD
CY2020Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	31000	USD
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.275
CY2020Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	39471000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	5126106000	USD
CY2021Q2	us-gaap	Stockholders Equity StockholdersEquity	5547548000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	225449000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-42879000	USD
CY2021Q3	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	7792000	USD
CY2021Q3	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	254000	USD
CY2021Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.330
CY2021Q3	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	47455000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	5690201000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	5017617000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	24051000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.825
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	119408000	USD
CY2020Q3	us-gaap	Stockholders Equity StockholdersEquity	5126106000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	5269175000	USD
	us-gaap	Net Income Loss NetIncomeLoss	655185000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-101893000	USD
	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	25520000	USD
	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	15508000	USD
	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.990
	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	142278000	USD
CY2021Q3	us-gaap	Stockholders Equity StockholdersEquity	5690201000	USD
	us-gaap	Net Income Loss NetIncomeLoss	655185000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	116371000	USD
	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	96089000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	-17392000	USD
	ewbc	Accretion Amortizationof Discountand Premiums Net AccretionAmortizationofDiscountandPremiumsNet	17974000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	24047000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	22201000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	787000	USD
	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-91000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-25000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6601000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1443000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	1178000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain Loss Excluding Other Than Temporary Impairment DebtSecuritiesAvailableForSaleRealizedGainLossExcludingOtherThanTemporaryImpairment	11867000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	4843000	USD
	us-gaap	Asset Impairment Charges AssetImpairmentCharges	0	USD
	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	1954000	USD
	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	0	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	9323000	USD
	us-gaap	Payments For Origination And Purchases Of Loans Held For Sale PaymentsForOriginationAndPurchasesOfLoansHeldForSale	53911000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	11337000	USD
	us-gaap	Proceeds From Sale And Collection Of Loans Heldforsale ProceedsFromSaleAndCollectionOfLoansHeldforsale	50339000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	7624000	USD
	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	4934000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	78649000	USD
	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	467077000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	30179000	USD
	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	220343000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	771000	USD
	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	529000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	90646000	USD
	us-gaap	Adjustments To Reconcile Net Income Loss To Cash Provided By Used In Operating Activities AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities	28385000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	745831000	USD
	ewbc	Assets Sold Under Agreements To Repurchase Weighted Average Interest Rate AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate	0.0364
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1346839000	USD
	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	432098000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	141882000	USD
	ewbc	Paymentsfor Proceedsfrom Qualified Affordable Housing Partnershipsand Other Tax Credit Investments PaymentsforProceedsfromQualifiedAffordableHousingPartnershipsandOtherTaxCreditInvestments	102190000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	4576000	USD
	us-gaap	Proceeds From Payments For In Interest Bearing Deposits In Banks ProceedsFromPaymentsForInInterestBearingDepositsInBanks	-503187000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	698274000	USD
	us-gaap	Proceeds From Securities Purchased Under Agreements To Resell ProceedsFromSecuritiesPurchasedUnderAgreementsToResell	400000000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	1834416000	USD
	us-gaap	Payments For Securities Purchased Under Agreements To Resell PaymentsForSecuritiesPurchasedUnderAgreementsToResell	500000000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	236967000	USD
	us-gaap	Proceeds From Sale Of Available For Sale Securities Debt ProceedsFromSaleOfAvailableForSaleSecuritiesDebt	494877000	USD
	us-gaap	Proceeds From Maturities Prepayments And Calls Of Available For Sale Securities ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities	1532411000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	5884389000	USD
	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	3167863000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	416426000	USD
	us-gaap	Proceeds From Sale Of Finance Receivables ProceedsFromSaleOfFinanceReceivables	254035000	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	2601000	USD
CY2021Q3	ewbc	Assets Sold Under Agreements To Repurchase Weighted Average Interest Rate AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate	0.0257
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	746395000	USD
	us-gaap	Payments To Acquire Finance Receivables PaymentsToAcquireFinanceReceivables	163861000	USD
	us-gaap	Payments For Proceeds From Other Loans And Leases PaymentsForProceedsFromOtherLoansAndLeases	1798011000	USD
	us-gaap	Payments For Proceeds From Other Loans And Leases PaymentsForProceedsFromOtherLoansAndLeases	2764867000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	28560000	USD
	us-gaap	Proceeds From Sale Of Foreclosed Assets ProceedsFromSaleOfForeclosedAssets	0	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	150000000	USD
	us-gaap	Payments To Acquire Life Insurance Policies PaymentsToAcquireLifeInsurancePolicies	0	USD
	us-gaap	Proceeds From Equity Method Investment Dividends Or Distributions Return Of Capital ProceedsFromEquityMethodInvestmentDividendsOrDistributionsReturnOfCapital	5626000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	61000	USD
	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	2223000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-7817886000	USD
	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-4520267000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	8486734000	USD
	us-gaap	Increase Decrease In Deposits IncreaseDecreaseInDeposits	4337096000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-21143000	USD
	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	30916000	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	0	USD
	us-gaap	Proceeds From Federal Home Loan Bank Borrowings ProceedsFromFederalHomeLoanBankBorrowings	10200000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	405000000	USD
	us-gaap	Repayments Of Federal Home Loan Bank Borrowings RepaymentsOfFederalHomeLoanBankBorrowings	100200000	USD
	ewbc	Proceeds From Repurchase Agreements ProceedsFromRepurchaseAgreements	0	USD
	ewbc	Proceeds From Repurchase Agreements ProceedsFromRepurchaseAgreements	48063000	USD
	ewbc	Repayments Of Repurchase Agreement RepaymentsOfRepurchaseAgreement	0	USD
	ewbc	Repayments Of Repurchase Agreement RepaymentsOfRepurchaseAgreement	150000000	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	8740000	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	0	USD
	us-gaap	Proceeds From Issuance Of Other Long Term Debt ProceedsFromIssuanceOfOtherLongTermDebt	1437269000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	909000	USD
	us-gaap	Repayments Of Other Long Term Debt RepaymentsOfOtherLongTermDebt	10609000	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	145966000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1180000	USD
	us-gaap	Proceeds From Issuance Of Shares Under Incentive And Share Based Compensation Plans Including Stock Options ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlansIncludingStockOptions	1170000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	15508000	USD
	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7656000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	141911000	USD
	us-gaap	Payments Of Ordinary Dividends PaymentsOfOrdinaryDividends	119185000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	7903443000	USD
	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	5322358000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3542000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3542000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11603000	USD
	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	11603000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	834930000	USD
	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1245792000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4017971000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3261149000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3261149000	USD
	us-gaap	Interest Paid Net InterestPaidNet	70833000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	82114000	USD
CY2021Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4852901000	USD
CY2020Q3	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4506941000	USD
	us-gaap	Interest Paid Net InterestPaidNet	188657000	USD
	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	137452000	USD
	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	411416000	USD
	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	253302000	USD
	ewbc	Transferof Financing Receivables To Foreclosed Assets TransferofFinancingReceivablesToForeclosedAssets	49122000	USD
	ewbc	Transferof Financing Receivables To Foreclosed Assets TransferofFinancingReceivablesToForeclosedAssets	19504000	USD
CY2021Q3	ewbc	Number Of Wholly Owned Statutory Business Trusts NumberOfWhollyOwnedStatutoryBusinessTrusts	6	trust
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000	USD
CY2021Q3	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1340000000	USD
CY2020Q4	us-gaap	Securities Purchased Under Agreements To Resell Gross SecuritiesPurchasedUnderAgreementsToResellGross	1160000000	USD
CY2021Q3	ewbc	Loans Purchased Under Agreements To Resell LoansPurchasedUnderAgreementsToResell	1260000000	USD
CY2020Q4	ewbc	Loans Purchased Under Agreements To Resell LoansPurchasedUnderAgreementsToResell	300000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000	USD
	ewbc	Assets Sold Under Agreements To Repurchase Weighted Average Interest Rate AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate	0.0262
CY2020Q3	ewbc	Assets Sold Under Agreements To Repurchase Weighted Average Interest Rate AssetsSoldUnderAgreementsToRepurchaseWeightedAverageInterestRate	0.0270
CY2021Q3	ewbc	Assets Purchased Under Agreements To Resell Gross AssetsPurchasedUnderAgreementsToResellGross	2596142000	USD
CY2021Q3	ewbc	Assets Purchased Under Agreements To Resell Liability AssetsPurchasedUnderAgreementsToResellLiability	0	USD
CY2021Q3	ewbc	Assets Purchased Under Agreements To Resell AssetsPurchasedUnderAgreementsToResell	2596142000	USD
CY2021Q3	ewbc	Assets Purchased Under Agreements To Resell Collateral Obligation To Return Assets AssetsPurchasedUnderAgreementsToResellCollateralObligationToReturnAssets	2580187000	USD
CY2021Q3	ewbc	Assets Purchased Under Agreements To Resell Amount Offset Against Collateral AssetsPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	-15955000	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	300000000	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	300000000	USD
CY2021Q3	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2020Q4	ewbc	Assets Purchased Under Agreements To Resell Gross AssetsPurchasedUnderAgreementsToResellGross	1460000000	USD
CY2020Q4	ewbc	Assets Purchased Under Agreements To Resell Liability AssetsPurchasedUnderAgreementsToResellLiability	0	USD
CY2020Q4	ewbc	Assets Purchased Under Agreements To Resell AssetsPurchasedUnderAgreementsToResell	1460000000	USD
CY2020Q4	ewbc	Assets Purchased Under Agreements To Resell Collateral Obligation To Return Assets AssetsPurchasedUnderAgreementsToResellCollateralObligationToReturnAssets	1458700000	USD
CY2020Q4	ewbc	Assets Purchased Under Agreements To Resell Amount Offset Against Collateral AssetsPurchasedUnderAgreementsToResellAmountOffsetAgainstCollateral	-1300000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Gross SecuritiesSoldUnderAgreementsToRepurchaseGross	300000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Asset SecuritiesSoldUnderAgreementsToRepurchaseAsset	0	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase SecuritiesSoldUnderAgreementsToRepurchase	300000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Collateral Right To Reclaim Securities SecuritiesSoldUnderAgreementsToRepurchaseCollateralRightToReclaimSecurities	300000000	USD
CY2020Q4	us-gaap	Securities Sold Under Agreements To Repurchase Amount Offset Against Collateral SecuritiesSoldUnderAgreementsToRepurchaseAmountOffsetAgainstCollateral	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	9783180000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	63504000	USD
CY2021Q3	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	133678000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9713006000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	5470523000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	359	security
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax	96596000	USD
CY2020Q4	us-gaap	Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax	22461000	USD
CY2020Q4	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	5544658000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	5715518000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	106241000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	873339000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	27437000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	6588857000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	133678000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months	1519603000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position Less Than12 Months Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss	15456000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger	342859000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Continuous Unrealized Loss Position12 Months Or Longer Accumulated Loss DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss	7005000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position DebtSecuritiesAvailableForSaleUnrealizedLossPosition	1862462000	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Accumulated Loss DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss	22461000	USD
	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Unrealized Loss Position Number Of Positions DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions	104	security
CY2020	us-gaap	Debt Securities Available For Sale Change In Present Value Expense Reversal DebtSecuritiesAvailableForSaleChangeInPresentValueExpenseReversal	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2020Q4	us-gaap	Debt Securities Available For Sale Amortized Cost Allowance For Credit Loss Excluding Accrued Interest DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest	0	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	354000	USD
CY2020Q3	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	698000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	1178000	USD
	us-gaap	Debt Securities Available For Sale Realized Gain DebtSecuritiesAvailableForSaleRealizedGain	11867000	USD
CY2021Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	104000	USD
CY2020Q3	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	206000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	348000	USD
	ewbc	Tax Expenseon Saleof Availablefor Sale Debt Investment Securities TaxExpenseonSaleofAvailableforSaleDebtInvestmentSecurities	3508000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost	1522146000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	1486148000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost	845850000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After One Through Five Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue	848562000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost	1618344000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Five Through Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue	1618061000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Amortized Cost AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost	5796840000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Maturities After Ten Years Fair Value AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue	5760235000	USD
CY2021Q3	us-gaap	Debt Securities Available For Sale Amortized Cost Excluding Accrued Interest Before Allowance For Credit Loss DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestBeforeAllowanceForCreditLoss	9783180000	USD
CY2021Q3	us-gaap	Available For Sale Securities Debt Securities AvailableForSaleSecuritiesDebtSecurities	9713006000	USD
CY2021Q3	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	859900000	USD
CY2020Q4	us-gaap	Pledged Assets Separately Reported Securities Pledged As Collateral At Fair Value PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue	588500000	USD
CY2021Q3	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	59950000	USD
CY2020Q4	us-gaap	Federal Reserve Bank Stock FederalReserveBankStock	59249000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	17250000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Stock FederalHomeLoanBankStock	23797000	USD
CY2021Q3	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	77200000	USD
CY2020Q4	us-gaap	Federal Home Loan Bank Stock And Federal Reserve Bank Stock FederalHomeLoanBankStockAndFederalReserveBankStock	83046000	USD
CY2021Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	694010000	USD
CY2021Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	561788000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	602754000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	424828000	USD
CY2021Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	102515000	USD
CY2021Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	102515000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	93063000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	93063000	USD
CY2021Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	62968000	USD
CY2021Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	240104000	USD
CY2020Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	8449000	USD
CY2020Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	91634000	USD
CY2021Q3	us-gaap	Derivative Assets DerivativeAssets	528527000	USD
CY2021Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	219169000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	501242000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	240131000	USD
	us-gaap	Derivatives Methods Of Accounting Hedging Derivatives DerivativesMethodsOfAccountingHedgingDerivatives	For cash flow hedges, the entire change in the fair value of the hedging instruments is recognized in AOCI and reclassified to earnings in the same period when the hedged cash flows impact earnings. Reclassified gains and losses on interest rate swaps are recorded in the same line item as the interest payments of the hedged long-term borrowings within Interest expense in the Consolidated Statements of Income.
CY2021Q3	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	694010000	USD
CY2021Q3	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	102515000	USD
CY2021Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	62968000	USD
CY2021Q3	us-gaap	Derivative Assets DerivativeAssets	528527000	USD
CY2021Q3	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	0	USD
CY2021Q3	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	528527000	USD
CY2021Q3	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	561788000	USD
CY2021Q3	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	102515000	USD
CY2021Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	240104000	USD
CY2021Q3	us-gaap	Derivative Liabilities DerivativeLiabilities	219169000	USD
CY2021Q3	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	157315000	USD
CY2021Q3	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	61854000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Asset Including Not Subject To Master Netting Arrangement DerivativeAssetFairValueGrossAssetIncludingNotSubjectToMasterNettingArrangement	602754000	USD
CY2020Q4	us-gaap	Derivative Asset Fair Value Gross Liability DerivativeAssetFairValueGrossLiability	93063000	USD
CY2020Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	8449000	USD
CY2020Q4	us-gaap	Derivative Assets DerivativeAssets	501242000	USD
CY2020Q4	us-gaap	Derivative Collateral Obligation To Return Securities DerivativeCollateralObligationToReturnSecurities	35000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Asset Amount Offset Against Collateral DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral	501207000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Liability Including Not Subject To Master Netting Arrangement DerivativeLiabilityFairValueGrossLiabilityIncludingNotSubjectToMasterNettingArrangement	424828000	USD
CY2020Q4	us-gaap	Derivative Liability Fair Value Gross Asset DerivativeLiabilityFairValueGrossAsset	93063000	USD
CY2020Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	91634000	USD
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	240131000	USD
CY2020Q4	us-gaap	Derivative Collateral Right To Reclaim Securities DerivativeCollateralRightToReclaimSecurities	221150000	USD
CY2020Q4	us-gaap	Derivative Fair Value Of Derivative Liability Amount Offset Against Collateral DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral	18981000	USD
CY2021Q3	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	1200000	USD
CY2020Q4	us-gaap	Derivative Asset Not Subject To Master Netting Arrangement DerivativeAssetNotSubjectToMasterNettingArrangement	1100000	USD
CY2021Q3	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	1400000	USD
CY2020Q4	us-gaap	Derivative Liability Not Subject To Master Netting Arrangement DerivativeLiabilityNotSubjectToMasterNettingArrangement	220000	USD
CY2021Q3	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	67100000	USD
CY2020Q4	ewbc	Derivative Cash Collateral Received Including Amount Offsetby Fair Value Assetsand Excess Cash Amount DerivativeCashCollateralReceivedIncludingAmountOffsetbyFairValueAssetsandExcessCashAmount	15800000	USD
CY2021Q3	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	63000000	USD
CY2020Q4	us-gaap	Derivative Asset Collateral Obligation To Return Cash Offset DerivativeAssetCollateralObligationToReturnCashOffset	8400000	USD
CY2021Q3	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	240100000	USD
CY2020Q4	ewbc	Derivative Cash Collateral Posted Against Derivative Liabilities Including Amount Offsetthe Derivative Fair Value Liabilitiesand Excess Cash Amount DerivativeCashCollateralPostedAgainstDerivativeLiabilitiesIncludingAmountOffsettheDerivativeFairValueLiabilitiesandExcessCashAmount	91600000	USD
CY2021Q3	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	240100000	USD
CY2020Q4	us-gaap	Derivative Liability Collateral Right To Reclaim Cash Offset DerivativeLiabilityCollateralRightToReclaimCashOffset	91600000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	40481705000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	38390955000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	560404000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	619983000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	39921301000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest After Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss	37770972000	USD
CY2021Q3	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-54300000	USD
CY2020Q4	us-gaap	Unamortized Loan Commitment And Origination Fees And Unamortized Discounts Or Premiums UnamortizedLoanCommitmentAndOriginationFeesAndUnamortizedDiscountsOrPremiums	-58800000	USD
CY2021Q3	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	102700000	USD
CY2020Q4	us-gaap	Financing Receivable Accrued Interest Before Allowance For Credit Loss FinancingReceivableAccruedInterestBeforeAllowanceForCreditLoss	107500000	USD
CY2021Q3	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	24550000000	USD
CY2020Q4	us-gaap	Loans Pledged As Collateral LoansPledgedAsCollateral	23260000000	USD
	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%">Credit Quality Indicators</span></div><div style="text-align:justify"><span><br/></span></div><div style="text-align:justify;text-indent:36pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">All loans are subject to the Company’s credit review and monitoring process. For the commercial portfolio, loans are risk rated based on an analysis of the borrower’s current payment performance or delinquency, repayment sources, financial and liquidity factors, including industry and geographic considerations. For a majority of the consumer portfolio, payment performance or delinquency is the driving indicator for the risk ratings. The Company utilizes internal credit risk ratings to assign each individual loan a risk rating of one through ten. Loans risk rated one through five are assigned an internal risk rating category of “Pass.” Loans risk rated one are typically loans fully secured by cash. Pass loans have sufficient sources of repayment to repay the loan in full, in accordance with all terms and conditions. Loans assigned a risk rating of six have potential weaknesses that warrant closer attention by management; these are assigned an internal risk rating category of “Special Mention.” Loans assigned a risk rating of seven or eight have well-defined weaknesses that may jeopardize the full and timely repayment of the loan; these are assigned an internal risk rating category of “Substandard.” Loans assigned a risk rating of nine have insufficient sources of repayment and a high probability of loss; these are assigned an internal risk rating category of “Doubtful.” Loans assigned a risk rating of ten are uncollectible and of such little value that they are no longer considered bankable assets; these are assigned an internal risk rating category of “Loss.” Exposures categorized as criticized consist of special mention, substandard, doubtful and loss categories. The Company reviews the internal risk ratings of its loan portfolio on a regular basis, and adjusts the ratings based on changes in the borrowers’ financial status and the collectability of the loans.</span></div>
CY2021Q3	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	8122458000	USD
CY2021Q3	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	6886022000	USD
CY2021Q3	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	5487019000	USD
CY2021Q3	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3983548000	USD
CY2021Q3	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	2563182000	USD
CY2021Q3	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3953468000	USD
CY2021Q3	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	9222611000	USD
CY2021Q3	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	263397000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	40481705000	USD
CY2020Q4	us-gaap	Financing Receivable Originated In Current Fiscal Year FinancingReceivableOriginatedInCurrentFiscalYear	9787213000	USD
CY2020Q4	us-gaap	Financing Receivable Originated In Fiscal Year Before Latest Fiscal Year FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear	6816315000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Two Years Before Latest Fiscal Year FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear	5125324000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Three Years Before Latest Fiscal Year FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear	3167275000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Four Years Before Latest Fiscal Year FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear	1547971000	USD
CY2020Q4	us-gaap	Financing Receivable Originated Five Or More Years Before Latest Fiscal Year FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear	3277221000	USD
CY2020Q4	us-gaap	Financing Receivable Revolving FinancingReceivableRevolving	8390152000	USD
CY2020Q4	us-gaap	Financing Receivable Revolving Converted To Term Loan FinancingReceivableRevolvingConvertedToTermLoan	279484000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	38390955000	USD
CY2021Q3	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	133160000	USD
CY2021Q3	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	40481705000	USD
CY2020Q4	us-gaap	Financing Receivable Recorded Investment Nonaccrual Status FinancingReceivableRecordedInvestmentNonaccrualStatus	215154000	USD
CY2020Q4	us-gaap	Financing Receivable Excluding Accrued Interest Before Allowance For Credit Loss FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss	38390955000	USD
CY2021Q3	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	36238000	USD
CY2020Q4	us-gaap	Financing Receivable Nonaccrual No Allowance FinancingReceivableNonaccrualNoAllowance	126676000	USD
CY2021Q3	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	39500000	USD
CY2020Q4	us-gaap	Other Real Estate And Foreclosed Assets OtherRealEstateAndForeclosedAssets	19700000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	8	loan
CY2021Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	27349000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	28229000	USD
CY2021Q3	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	5688000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	9	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	66027000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	58036000	USD
CY2020Q3	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	12129000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	12	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	47245000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	47072000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	7662000	USD
	us-gaap	Financing Receivable Modifications Number Of Contracts2 FinancingReceivableModificationsNumberOfContracts2	14	loan
	us-gaap	Financing Receivable Modifications Pre Modification Recorded Investment2 FinancingReceivableModificationsPreModificationRecordedInvestment2	115884000	USD
CY2020Q4	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	3000000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	102181000	USD
	us-gaap	Financing Receivables Impaired Troubled Debt Restructuring Write Down FinancingReceivablesImpairedTroubledDebtRestructuringWriteDown	12528000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	28229000	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	58036000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	47072000	USD
	us-gaap	Financing Receivable Modifications Post Modification Recorded Investment2 FinancingReceivableModificationsPostModificationRecordedInvestment2	102181000	USD
CY2021Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2021Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	0	loan
CY2020Q3	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	0	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	11431000	USD
	us-gaap	Financing Receivable Modifications Subsequent Default Number Of Contracts1 FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1	1	loan
	us-gaap	Financing Receivable Modifications Subsequent Default Recorded Investment1 FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1	16309000	USD
CY2021Q3	us-gaap	Loans And Leases Receivable Impaired Commitment To Lend LoansAndLeasesReceivableImpairedCommitmentToLend	6800000	USD
CY2021Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	585724000	USD
CY2021Q3	ewbc	Reversal Of Provision For Credit Losses On Loans And Provision For Loan Losses ReversalOfProvisionForCreditLossesOnLoansAndProvisionForLoanLosses	-11736000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	18979000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	5465000	USD
CY2021Q3	ewbc	Financing Receivable Allowance For Credit Loss Write Off Net Of Recovery FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery	13514000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Foreign Currency Translation FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation	-70000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	560404000	USD
CY2020Q2	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	632071000	USD
CY2020Q3	ewbc	Reversal Of Provision For Credit Losses On Loans And Provision For Loan Losses ReversalOfProvisionForCreditLossesOnLoansAndProvisionForLoanLosses	9889000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	26649000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	2441000	USD
CY2020Q3	ewbc	Financing Receivable Allowance For Credit Loss Write Off Net Of Recovery FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery	24208000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Foreign Currency Translation FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation	500000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	4900000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	618252000	USD
CY2020Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	619983000	USD
	ewbc	Reversal Of Provision For Credit Losses On Loans And Provision For Loan Losses ReversalOfProvisionForCreditLossesOnLoansAndProvisionForLoanLosses	-19459000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	49938000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	9743000	USD
	ewbc	Financing Receivable Allowance For Credit Loss Write Off Net Of Recovery FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery	40195000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Foreign Currency Translation FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation	75000	USD
CY2021Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	560404000	USD
CY2019Q4	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	358287000	USD
	ewbc	Reversal Of Provision For Credit Losses On Loans And Provision For Loan Losses ReversalOfProvisionForCreditLossesOnLoansAndProvisionForLoanLosses	178845000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Write Offs FinancingReceivableAllowanceForCreditLossesWriteOffs	60555000	USD
	us-gaap	Financing Receivable Allowance For Credit Losses Recovery FinancingReceivableAllowanceForCreditLossesRecovery	16209000	USD
	ewbc	Financing Receivable Allowance For Credit Loss Write Off Net Of Recovery FinancingReceivableAllowanceForCreditLossWriteOffNetOfRecovery	44346000	USD
	us-gaap	Financing Receivable Allowance For Credit Loss Foreign Currency Translation FinancingReceivableAllowanceForCreditLossForeignCurrencyTranslation	308000	USD
CY2020Q3	us-gaap	Financing Receivable Allowance For Credit Loss Excluding Accrued Interest FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest	618252000	USD
CY2021Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-10000000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10000000	USD
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-515000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-25000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
CY2021Q3	ewbc	Financing Receivable And Off Balance Sheet Credit Loss Allowance FinancingReceivableAndOffBalanceSheetCreditLossAllowance	588400000	USD
	ewbc	Financing Receivable And Off Balance Sheet Credit Loss Allowance Period Increase Decrease FinancingReceivableAndOffBalanceSheetCreditLossAllowancePeriodIncreaseDecrease	-65200000	USD
CY2020Q4	ewbc	Financing Receivable And Off Balance Sheet Credit Loss Allowance FinancingReceivableAndOffBalanceSheetCreditLossAllowance	653600000	USD
CY2021Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-10000000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-25000000	USD
CY2021Q3	us-gaap	Loans Receivable Held For Sale Net Not Part Of Disposal Group LoansReceivableHeldForSaleNetNotPartOfDisposalGroup	0	USD
CY2021Q3	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	163780000	USD
CY2021Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	169830000	USD
CY2021Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	203291000	USD
CY2020Q3	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	89394000	USD
CY2020Q3	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	124084000	USD
CY2020Q3	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	18132000	USD
	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	411416000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	427427000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	745717000	USD
	us-gaap	Financing Receivable Transfer To Held For Sale Allowance For Credit Loss Expense Reversal FinancingReceivableTransferToHeldForSaleAllowanceForCreditLossExpenseReversal	253302000	USD
	us-gaap	Financing Receivable Significant Sales FinancingReceivableSignificantSales	306342000	USD
	us-gaap	Financing Receivable Significant Purchases FinancingReceivableSignificantPurchases	163822000	USD
CY2021Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	3600000	USD
CY2020Q3	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	2800000	USD
	us-gaap	Allowance For Loan And Lease Losses Write Offs AllowanceForLoanAndLeaseLossesWriteOffs	2800000	USD
CY2021Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	3300000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	6600000	USD
CY2020Q3	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	361000	USD
	us-gaap	Gain Loss On Sales Of Loans Net GainLossOnSalesOfLoansNet	1400000	USD
	ewbc	Minimum Compliance Period To Fully Utilize Tax Credits MinimumCompliancePeriodToFullyUtilizeTaxCredits	P15Y
	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	813000	USD
CY2021Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	297367000	USD
CY2020Q4	us-gaap	Amortization Method Qualified Affordable Housing Project Investments AmortizationMethodQualifiedAffordableHousingProjectInvestments	213555000	USD
CY2021Q3	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	148171000	USD
CY2020Q4	us-gaap	Qualified Affordable Housing Project Investments Commitment QualifiedAffordableHousingProjectInvestmentsCommitment	77444000	USD
CY2021Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	7503000	USD
CY2020Q3	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	11402000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	28583000	USD
	us-gaap	Affordable Housing Tax Credits And Other Tax Benefits Amount AffordableHousingTaxCreditsAndOtherTaxBenefitsAmount	34205000	USD
CY2021Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	9147000	USD
CY2020Q3	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	8975000	USD
CY2021Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	25595000	USD
	us-gaap	Amortization Method Qualified Affordable Housing Project Investments Amortization AmortizationMethodQualifiedAffordableHousingProjectInvestmentsAmortization	26507000	USD
CY2021Q3	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	367428000	USD
CY2020Q4	ewbc	Investmentsin Tax Creditand Other Investments Net InvestmentsinTaxCreditandOtherInvestmentsNet	266525000	USD
CY2021Q3	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	194796000	USD
CY2020Q4	ewbc	Other Tax Credit Investments Commitment OtherTaxCreditInvestmentsCommitment	105282000	USD
CY2021Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	38008000	USD
CY2020Q3	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	17209000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	90657000	USD
	ewbc	Noninterest Expense Amortizationof Tax Creditand Other Investments NoninterestExpenseAmortizationofTaxCreditandOtherInvestments	57819000	USD
CY2021Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	-88000	USD
CY2020Q3	us-gaap	Marketable Securities Unrealized Gain Loss MarketableSecuritiesUnrealizedGainLoss	55000	USD
	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2020Q3	us-gaap	Equity Securities Without Readily Determinable Fair Value Downward Price Adjustment Annual Amount EquitySecuritiesWithoutReadilyDeterminableFairValueDownwardPriceAdjustmentAnnualAmount	0	USD
CY2021Q3	us-gaap	Goodwill Goodwill	465700000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	465700000	USD
CY2020	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2021Q3	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2190000000	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	2240000000	USD
CY2021Q3	ewbc	Allowancefor Unfunded Credit Commitments AllowanceforUnfundedCreditCommitments	28000000	USD
CY2020Q4	ewbc	Allowancefor Unfunded Credit Commitments AllowanceforUnfundedCreditCommitments	33500000	USD
CY2021Q3	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	0	shares
CY2021Q3	us-gaap	Share Based Compensation ShareBasedCompensation	8022000	USD
CY2020Q3	us-gaap	Share Based Compensation ShareBasedCompensation	7921000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	24047000	USD
	us-gaap	Share Based Compensation ShareBasedCompensation	22201000	USD
CY2021Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	42000	USD
CY2020Q3	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-14000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	1699000	USD
	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	-1589000	USD
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	225449000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	159537000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	655185000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	403713000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141880000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141799000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
CY2021Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.59
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.13
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.62
	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.83
CY2021Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	225449000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	159537000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	655185000	USD
	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	403713000	USD
CY2021Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141880000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141498000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	141799000	shares
	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	142595000	shares
CY2021Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1263000	shares
CY2020Q3	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	545000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1252000	shares
	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	487000	shares
CY2021Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143143000	shares
CY2020Q3	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	142043000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143051000	shares
	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	143082000	shares
CY2021Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.57
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.12
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.58
	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.82
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	500000000	USD
CY2020	us-gaap	Stock Repurchased During Period Shares StockRepurchasedDuringPeriodShares	4471682	shares
CY2020	us-gaap	Treasury Stock Acquired Average Cost Per Share TreasuryStockAcquiredAverageCostPerShare	32.64
CY2020	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	146000000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-60299000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-17420000	USD
CY2021Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-42879000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	11146000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	966000	USD
CY2020Q3	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	10180000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-145143000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-43250000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-101893000	USD
	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	71435000	USD
	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	19713000	USD
	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	51722000	USD
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
	ewbc	Numberof Core Segment NumberofCoreSegment	2	segment
	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3	segment
CY2021Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	395706000	USD
CY2021Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-10000000	USD
CY2021Q3	us-gaap	Noninterest Income NoninterestIncome	73109000	USD
CY2021Q3	us-gaap	Noninterest Expense NoninterestExpense	205384000	USD
CY2021Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	273431000	USD
CY2021Q3	us-gaap	Net Income Loss NetIncomeLoss	225449000	USD
CY2021Q3	us-gaap	Assets Assets	60959110000	USD
CY2020Q3	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	324130000	USD
CY2020Q3	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	10000000	USD
CY2020Q3	us-gaap	Noninterest Income NoninterestIncome	54503000	USD
CY2020Q3	us-gaap	Noninterest Expense NoninterestExpense	172573000	USD
CY2020Q3	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	196060000	USD
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	159537000	USD
CY2020Q3	us-gaap	Assets Assets	50371477000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1125874000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	-25000000	USD
	us-gaap	Noninterest Income NoninterestIncome	214406000	USD
	us-gaap	Noninterest Expense NoninterestExpense	585984000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	779296000	USD
	us-gaap	Net Income Loss NetIncomeLoss	655185000	USD
CY2021Q3	us-gaap	Assets Assets	60959110000	USD
	us-gaap	Interest Income Expense Net InterestIncomeExpenseNet	1030612000	USD
	us-gaap	Provision For Loan Lease And Other Losses ProvisionForLoanLeaseAndOtherLosses	186313000	USD
	us-gaap	Noninterest Income NoninterestIncome	165715000	USD
	us-gaap	Noninterest Expense NoninterestExpense	537671000	USD
	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	472343000	USD
	us-gaap	Net Income Loss NetIncomeLoss	403713000	USD
CY2020Q3	us-gaap	Assets Assets	50371477000	USD

Files In Submission

Name	View Source	Status
0001069157-21-000081-index-headers.html	Edgar Link	pending
0001069157-21-000081-index.html	Edgar Link	pending
0001069157-21-000081.txt	Edgar Link	pending
0001069157-21-000081-xbrl.zip	Edgar Link	pending
ewbc-20210930.htm	Edgar Link	pending
ewbc-20210930.xsd	Edgar Link	pending
ewbc-20210930_cal.xml	Edgar Link	unprocessable
ewbc-20210930_def.xml	Edgar Link	unprocessable
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ewbc-20210930_htm.xml	Edgar Link	completed
ewbc-20210930_lab.xml	Edgar Link	unprocessable
ewbc-20210930_pre.xml	Edgar Link	unprocessable
ewbc10110q9302021.htm	Edgar Link	pending
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FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
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$EWBC
EAST WEST BANCORP INC Stock $ewbc

2021 Q4 Form 10-Q Financial Statement

#000106915721000081 Filed on November 08, 2021

Income Statement

Balance Sheet

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$EWBC EAST WEST BANCORP INC Stock $ewbc

2021 Q4 Form 10-Q Financial Statement

#000106915721000081 Filed on November 08, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$EWBC
EAST WEST BANCORP INC Stock $ewbc